package com.zhou.framework.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * 反射工具类
 * <p>
 * 封装Java反射相关的API,对外提供更好用的工具方法
 *
 * @author zhouplus [http://my.oschina.net/u/2303497/blog]
 * @date 2016/4/14  17:14
 */

public final class ReflectionUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(ReflectionUtil.class);

    /**
     * 创建实例
     */
    public static Object newInstance(Class<?> cls) {
        Object obj;
        try {
            obj = cls.newInstance();
        } catch (Exception e) {
            LOGGER.error("new instance failure", e);
            throw new RuntimeException(e);
        }
        return obj;
    }

    /**
     * 调用方法
     */
    public static Object invokeMethod(Object obj, Method method, Object... args) {
        Object result;

        try {
            method.setAccessible(true);
            result = method.invoke(obj, args);
        } catch (Exception e) {
            LOGGER.error("invoke method failure", e);
            throw new RuntimeException(e);
        }

        return result;
    }

    /**
     * 设置成员变量的值
     */
    public static void setField(Object obj, Field field, Object value) {
        try {
            field.setAccessible(true);
            field.set(obj, value);
        } catch (Exception e) {
            LOGGER.error("set field failure", e);
            throw new RuntimeException(e);
        }
    }

}
